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Maxillary molar distalization with aligners in adult patients: a multicenter retrospective study.

Ravera S, Castroflorio T, Garino F, Daher S, Cugliari G, Deregibus A - Prog Orthod (2016)

Bottom Line: No significant movements were detected on the lower arch.SN^GoGn and SPP^GoGn angles showed no significant differences between pre- and post-treatment cephalograms (P = 0.22 and P = 0.85, respectively).Aligner therapy in association with composite attachments and class II elastics can distalize maxillary first molars by 2.25 mm without significant tipping and vertical movements of the crown.

View Article: PubMed Central - PubMed

Affiliation: Post-Graduate School of Orthodontics, Lingotto - Dental School, Department of Surgical Sciences, University of Turin, Turin, Italy. serenaravera@gmail.com.

ABSTRACT

Background: The aim of the present study was to test the hypothesis that bodily maxillary molar distalization was not achievable in aligner orthodontics.

Methods: Forty lateral cephalograms obtained from 20 non-growing subjects (9 male, 11 female; average age 29.73 years) (group S), who underwent bilateral distalization of their maxillary dentition with Invisalign aligners (Align Technology, Inc., San José, CA, USA), were considered for the study. Skeletal class I or class II malocclusion and a bilateral end-to-end class II molar relationship were the main inclusion criteria. Cephalograms were taken at two time points: (T0) pretreatment and (T2) post-treatment. Treatment changes were evaluated between the time points using 39 variables by means of paired t test. The level of significance was set at P < 0.05. Reproducibility of measurements was assessed by the intraclass correlation coefficient (ICC).

Results: The mean treatment time was 24.3 ± 4.2 months. At the post-treatment point, the first molar moved distally 2.25 mm without significant tipping (P = 0.27) and vertical movements (P = 0.43). The second molar distalization was 2.52 mm without significant tipping (P = 0.056) and vertical movements (P = 0.25). No significant movements were detected on the lower arch. SN^GoGn and SPP^GoGn angles showed no significant differences between pre- and post-treatment cephalograms (P = 0.22 and P = 0.85, respectively).

Conclusions: Aligner therapy in association with composite attachments and class II elastics can distalize maxillary first molars by 2.25 mm without significant tipping and vertical movements of the crown. No changes to the facial height were revealed.

No MeSH data available.


Related in: MedlinePlus

Schematic illustration of linear measurements (mm) considered in the study. Horizontal measurements were expressed by the distance between the following points and the y axis (a perpendicular line to the palatal plane passing through the Ricketts’ Pt point); second molar horizontal distance from the center of the crown, from the mesiobuccal cusp, from the mesiobuccal root’s apex, from the palatal root’s apex; first molar horizontal distance from the center of the crown, from the mesiobuccal cusp, from the mesiobuccal root’s apex, from the palatal root’s apex; central incisor distance; central incisor edge distance, central incisor radicular apex distance. Vertical distances were expressed by the distance between the same points and the x axis (palatal plane) and between the occlusal plane (except for incisor edge point and mesiobuccal cusp point, both tangential the occlusal plane)
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Fig3: Schematic illustration of linear measurements (mm) considered in the study. Horizontal measurements were expressed by the distance between the following points and the y axis (a perpendicular line to the palatal plane passing through the Ricketts’ Pt point); second molar horizontal distance from the center of the crown, from the mesiobuccal cusp, from the mesiobuccal root’s apex, from the palatal root’s apex; first molar horizontal distance from the center of the crown, from the mesiobuccal cusp, from the mesiobuccal root’s apex, from the palatal root’s apex; central incisor distance; central incisor edge distance, central incisor radicular apex distance. Vertical distances were expressed by the distance between the same points and the x axis (palatal plane) and between the occlusal plane (except for incisor edge point and mesiobuccal cusp point, both tangential the occlusal plane)

Mentions: On the initial (T0) and final (T1) cephalograms, the reference axes were represented by the palatal plane (x axis) and by a perpendicular line to the palatal plane passing through the Ricketts’ Pt point (y axis) (Fig. 1). The occlusal plane was traced as well, passing trough the upper central incisor’s incisal edge and the mesial cusp of the first molar [24]. The palatal plane was used to measure vertical and angular movements (Fig. 2), the occlusal plane was used to measure vertical movements only, while the y axis was used to measure sagittal movements of the second molar, of the first molar, and of the central incisor (Fig. 3).Fig. 1


Maxillary molar distalization with aligners in adult patients: a multicenter retrospective study.

Ravera S, Castroflorio T, Garino F, Daher S, Cugliari G, Deregibus A - Prog Orthod (2016)

Schematic illustration of linear measurements (mm) considered in the study. Horizontal measurements were expressed by the distance between the following points and the y axis (a perpendicular line to the palatal plane passing through the Ricketts’ Pt point); second molar horizontal distance from the center of the crown, from the mesiobuccal cusp, from the mesiobuccal root’s apex, from the palatal root’s apex; first molar horizontal distance from the center of the crown, from the mesiobuccal cusp, from the mesiobuccal root’s apex, from the palatal root’s apex; central incisor distance; central incisor edge distance, central incisor radicular apex distance. Vertical distances were expressed by the distance between the same points and the x axis (palatal plane) and between the occlusal plane (except for incisor edge point and mesiobuccal cusp point, both tangential the occlusal plane)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4834290&req=5

Fig3: Schematic illustration of linear measurements (mm) considered in the study. Horizontal measurements were expressed by the distance between the following points and the y axis (a perpendicular line to the palatal plane passing through the Ricketts’ Pt point); second molar horizontal distance from the center of the crown, from the mesiobuccal cusp, from the mesiobuccal root’s apex, from the palatal root’s apex; first molar horizontal distance from the center of the crown, from the mesiobuccal cusp, from the mesiobuccal root’s apex, from the palatal root’s apex; central incisor distance; central incisor edge distance, central incisor radicular apex distance. Vertical distances were expressed by the distance between the same points and the x axis (palatal plane) and between the occlusal plane (except for incisor edge point and mesiobuccal cusp point, both tangential the occlusal plane)
Mentions: On the initial (T0) and final (T1) cephalograms, the reference axes were represented by the palatal plane (x axis) and by a perpendicular line to the palatal plane passing through the Ricketts’ Pt point (y axis) (Fig. 1). The occlusal plane was traced as well, passing trough the upper central incisor’s incisal edge and the mesial cusp of the first molar [24]. The palatal plane was used to measure vertical and angular movements (Fig. 2), the occlusal plane was used to measure vertical movements only, while the y axis was used to measure sagittal movements of the second molar, of the first molar, and of the central incisor (Fig. 3).Fig. 1

Bottom Line: No significant movements were detected on the lower arch.SN^GoGn and SPP^GoGn angles showed no significant differences between pre- and post-treatment cephalograms (P = 0.22 and P = 0.85, respectively).Aligner therapy in association with composite attachments and class II elastics can distalize maxillary first molars by 2.25 mm without significant tipping and vertical movements of the crown.

View Article: PubMed Central - PubMed

Affiliation: Post-Graduate School of Orthodontics, Lingotto - Dental School, Department of Surgical Sciences, University of Turin, Turin, Italy. serenaravera@gmail.com.

ABSTRACT

Background: The aim of the present study was to test the hypothesis that bodily maxillary molar distalization was not achievable in aligner orthodontics.

Methods: Forty lateral cephalograms obtained from 20 non-growing subjects (9 male, 11 female; average age 29.73 years) (group S), who underwent bilateral distalization of their maxillary dentition with Invisalign aligners (Align Technology, Inc., San José, CA, USA), were considered for the study. Skeletal class I or class II malocclusion and a bilateral end-to-end class II molar relationship were the main inclusion criteria. Cephalograms were taken at two time points: (T0) pretreatment and (T2) post-treatment. Treatment changes were evaluated between the time points using 39 variables by means of paired t test. The level of significance was set at P < 0.05. Reproducibility of measurements was assessed by the intraclass correlation coefficient (ICC).

Results: The mean treatment time was 24.3 ± 4.2 months. At the post-treatment point, the first molar moved distally 2.25 mm without significant tipping (P = 0.27) and vertical movements (P = 0.43). The second molar distalization was 2.52 mm without significant tipping (P = 0.056) and vertical movements (P = 0.25). No significant movements were detected on the lower arch. SN^GoGn and SPP^GoGn angles showed no significant differences between pre- and post-treatment cephalograms (P = 0.22 and P = 0.85, respectively).

Conclusions: Aligner therapy in association with composite attachments and class II elastics can distalize maxillary first molars by 2.25 mm without significant tipping and vertical movements of the crown. No changes to the facial height were revealed.

No MeSH data available.


Related in: MedlinePlus